chem vocab

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Across
  1. 6. total number of protons plus neutrons
  2. 8. weighted average of the masses of its isotopes
  3. 9. property- a characteristic that is large enough to see, handle or measure without magnification
  4. 10. symbol-one or 2 letters representing an element
  5. 11. atoms with same number of protons but different number of neutrons
Down
  1. 1. energy-total kinetic energy of all the particles that make up the matter
  2. 2. potential energy-energy stored in the chemical bonds that hold atoms together
  3. 3. everything around the system
  4. 4. the number of protons in the nucleus of an atom
  5. 5. capacity to move,change matter or produce heat
  6. 7. portion of the universe that a scientist identifies for study